41 i Proceedings of the Royal Irish Academy. 



broadly, however, y. couchi is a more distictly shallow-water species 

 than M. norvegim. Like the latter, it is a favourite food of pelagic fishes. 

 Thysanoessa iaermis (Kroyer). — This species has a distribution in the district 

 under review entirely coincident with that of M. norvegica, and N. covxhi 

 and is usually found associated with them. Under this species I 

 include records formerly listed under the name Boreophaitsia inermis 

 (Kroyer), and Thysanoessa iieglecta (Kroyer), since, according to Hansen, 

 these two supposedly distinct species are merely dimorphic forms of 

 one species, which must bear the earlier name here given to it. 



MYSLDACEA. 



Siriella armata (Milne-Edwards). — Xear Portlea, Clare Island, 5-6 fms. 

 Inishgowla Harbour, Clew Bay, 1—4 fms. South side of Feorinyeeo 

 Bay, Blacksod Bay, shore. Feorinyeeo Bay, 2- 5 fms. Elly Bay, Blacksod 

 Bay, 1-3 fms. Carrigeenmore, Blacksod Bay, in tow-net through weeds, 

 close to shore. Entrance to Blacksod Bay, 7 fms. Bonn Harbour, very 

 common. Ballynakill Harbour, common. Cleggan Bay, 17 fms. 



A very common and abundant species in the district, generally found 

 living among Laminaria and other seaweeds, or in rock-pools, and 

 frequently captured free-s wimmin g at night, by means of tow-nets. 



S. clausii, G. 0. Sars. — Inishgowla Harbour, Clew Bay, 1-4 fms. South side 

 of Feorinygeeo Bay, Blacksod Bay, rock-pools on the shore. Entrance 

 to Blacksod Bay, 7 fms. Cleggan Bay, 17 fms. 2£ miles S."W". by W. 

 of Shark Head, Inishark, surface. Half mile X. of Cleggan Head, 

 surface. Bofin Harbour, very abundant. Ballynakill Harbour, very 

 abundant. 



A very common species, especially abundant at night in the harbours 

 and shallow bays of the area. 



S. jaltensis, Czerniavsky. — Carrigeenmore, Blacksod Bay, shore. South side 

 of Feorinyeeo Bay, Blacksod Bay, shore. Elly Bay, Blacksod Bay, shore. 

 Barranagh, Blacksod Bay, 2-3 fms. Portlea, Clare Island, in tow-net. 

 2| miles S.W. by W. of Shark Head, Inishark, surface. 2 miles W. by 

 S. of Inishturk, surface. 5 mile X. of Cleggan Head, surface. Bofin 

 Harbour, very abundant. Ballynakill Harbour, very common. 



A species of similar habitats and abundance to S. clausii, and usually 

 found associated with it. It has not been previously recorded from the 

 area under review, though known to me for several years from the 

 collections of the Fisheries Branch of the Department of Agriculture 

 for Ireland. 



